const idcard = function (code) {
  // 消除空格
  if (code) {
    code = code.toString().trim();
    if (code.indexOf('#') > 0) {
      code = code.replace('#', 'X');
    }
    if (code.indexOf('*') > 0) {
      code = code.replace('*', 'X');
    }
  } else {
    return false;
  }

  var city = {
    11: '北京',
    12: '天津',
    13: '河北',
    14: '山西',
    15: '内蒙古',
    21: '辽宁',
    22: '吉林',
    23: '黑龙江 ',
    31: '上海',
    32: '江苏',
    33: '浙江',
    34: '安徽',
    35: '福建',
    36: '江西',
    37: '山东',
    41: '河南',
    42: '湖北 ',
    43: '湖南',
    44: '广东',
    45: '广西',
    46: '海南',
    50: '重庆',
    51: '四川',
    52: '贵州',
    53: '云南',
    54: '西藏 ',
    61: '陕西',
    62: '甘肃',
    63: '青海',
    64: '宁夏',
    65: '新疆',
    71: '台湾',
    81: '香港',
    82: '澳门',
    91: '国外 '
  };

  const IDCARD_FORMATE_ERROR = -1
  const ADDRESS_ERROR = -2
  const CHECK_FLAG = -3
  const BRITHDATE_ERROR = -4

  var rt = {
    errCode: 0, // 0 正确,负数错误
    errMsg: '身份证正确'
  }
  var bd = code.substring(6, 10)
  var ny = new Date().getFullYear()
  if (bd > ny) {
    rt.errCode = BRITHDATE_ERROR
    rt.errMsg = '身份证生日时间错误'
  } else if (!code || !/^[1-9][0-9]{5}(19[0-9]{2}|20[0-9][0-9])(0[1-9]|1[0-2])(0[1-9]|[12][0-9]|3[01])[0-9]{3}[0-9xX]$/i.test(code)) {
    rt.errCode = IDCARD_FORMATE_ERROR
    rt.errMsg = '身份证号格式错误'
  } else if (!city[code.substr(0, 2)]) {
    rt.errCode = ADDRESS_ERROR
    rt.errMsg = '地址编码错误'
  } else {
    // 18位身份证需要验证最后一位校验位
    if (code.length === 18) {
      code = code.split('');
      // ∑(ai×Wi)(mod 11) 加权因子
      var factor = [
        7,
        9,
        10,
        5,
        8,
        4,
        2,
        1,
        6,
        3,
        7,
        9,
        10,
        5,
        8,
        4,
        2
      ];
      // 校验位
      var parity = [
        1,
        0,
        'X',
        9,
        8,
        7,
        6,
        5,
        4,
        3,
        2
      ];
      var sum = 0;
      var ai = 0;
      var wi = 0;
      for (var i = 0; i < 17; i++) {
        ai = code[i];
        wi = factor[i];
        sum += ai * wi;
      }

      var last = parity[sum % 11];
      // 身份证校验位
      var lastCode = code[17];
      if (!/^[0-9]*$/.test(last)) {
        last = last.toLowerCase();
      }
      if (!/^[0-9]*$/.test(lastCode)) {
        lastCode = lastCode.toLowerCase();
      }
      if (last !== (lastCode / 1)) {
        rt.errCode = CHECK_FLAG
        rt.errMsg = '校验位错误'
      }
    }
  }
  return rt
}

export default idcard
